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Dimensions, Tolerance and Assemblies - Coggle Diagram
Dimensions, Tolerance and Assemblies
Types of dimensioning
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chain dimensioning
should only be used if the function of the object would not be affected by the accumulation of tolerences
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dimensioning of circle, arc and hole
a circle is dimensioned by its diameter
an arc is dimensioned by its radius
holes are located by its centreline
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Rules of Dimensioning
Dimensions should not be duplicated, i.e. same dimension should not be repeated on different views, or the same information need not be given in two different ways
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Dimension lines, extension lines and object outlines should not cross or overlap
types of tolerances
Bilateral Tolerance: allowed to vary in two directions from the specified dimension. Both directions need not vary by the same amount.
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